I could produce the css code you need:
span.new {
padding-right:5px;
padding-left: 25px;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
/* Next 6 lines do the same thing but they are used to prevent compatibility issiues in different browsers */
background-image: -ms-linear-gradient(left, #FFFFFF 0%, #EFA718 100%);
background-image: -moz-linear-gradient(left, #FFFFFF 0%, #EFA718 100%);
background-image: -o-linear-gradient(left, #FFFFFF 0%, #EFA718 100%);
background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #FFFFFF), color-stop(1, #EFA718));
background-image: -webkit-linear-gradient(left, #FFFFFF 0%, #EFA718 100%);
background-image: linear-gradient(to right, #FFFFFF 0%, #EFA718 100%);
}
you can get help from http://ie.microsoft.com/testdrive/graphics/cssgradientbackgroundmaker/
and play with it.